Gmt module: Conversion function for GMTRegion now using new parameter reading scheme and error reporting.

modules/gmt/modgmt_func.h

@@ -225,95 +225,77 @@ template<>
 class Convert2Struct<struct gmt_region, ObjectList>
 {
  public:
- struct gmt_region operator()(const ObjectList* input, bool* issuc) const
+ struct gmt_region operator()(const ObjectList* input, bool* issuc, std::string& err) const
  {
   struct gmt_region r;
-  auto size=input->Size();
   bool suc=true;
 
-  if(1==size) // Cases 1, 2 and 3
+  if(1==input->Size()) // Cases 1, 2 and 3
   {
-   Base2Region region(input,0);
-   r=region(&suc);
+   Base2Region region;
+   r=region.Convert(input->At(0),&suc,err);
    if(!suc) goto fail; // Conversion failed
    return r;
   }
 
   // Case 4
   {
-   std::string type;
-   bool typeexist=false;
-   {
-    Base2String t(input,"type");
-    if(t.Exist())
-    {
-     type=t(&suc);
-     tolower(type);
-     if(!suc) goto fail; // Conversion failed
-     typeexist=true;
-    }
-    else type="nobbox";
-   }
-   if(r.Convert(type)) return r; // type is one of "global*" string, we can return, becuse upd is irrelevant
+   ONFPar<Base2Region,ObjectGMTRegion> region("region");
+   ONPar<Base2StringD> type("type","nobbox");
+   ONPar<Base2Coord> xb("xb"),xe("xe"),yb("yb"),ye("ye");
 
-   bool upd;
+   {ParseNamedParameters params(input,type,region,xb,xe,yb,ye); if(!params) {err=params.Error(); goto fail;} } // Fail to parse by variant 4
+
+   bool typeexist=type.Exist();
    {
-    BaseMT2Region updarg(input,"r","region");
-    r=updarg(&upd,&suc);
-    if(upd && !suc) goto fail; // Conversion failed or too many arguments
-    suc=true;
+    std::string t;
+    if(r.Convert(type,t)) return r; // type is one of "global*" string, we can return, because upd is irrelevant
    }
 
-   Base2Coord ixb(input,"xb"), ixe(input,"xe"), iyb(input,"yb"), iye(input,"ye");
-   if(!(typeexist || ixb.Exist() || ixe.Exist() || iyb.Exist() || iye.Exist() || upd)) goto case5; // No named parameters, no update mode, possibly case 5
-   struct gmt_coord xb,yb,xe,ye;
+   bool upd=region.Exist();
+
+   if(!(typeexist || xb.Exist() || xe.Exist() || yb.Exist() || ye.Exist() || upd)) goto case5; // No named parameters, no update mode, possibly case 5
+   struct gmt_coord cxb,cxe,cyb,cye;
    bool isbbox=upd?(gmt_region::BBOX==r.type):false;
 
    if(typeexist)
    {
-    if("bbox"==type) isbbox=true;
-    if("nobbox"==type) isbbox=false;
-    if("bbox"!=type && "nobbox"!=type) goto fail; // Unknown type
+    if("bbox"==type.Value()) isbbox=true;
+    if("nobbox"==type.Value()) isbbox=false;
+    if("bbox"!=type.Value() && "nobbox"!=type.Value()) goto fail; // Unknown type
    }
 
    if(upd)
    {
-    if(!ixb.Exist()) xb=r.xb;
-    if(!ixe.Exist()) xe=r.xe;
-    if(!iyb.Exist()) yb=r.yb;
-    if(!iye.Exist()) ye=r.ye;
+    cxb=xb.Exist()?xb:region->xb;
+    cxe=xe.Exist()?xe:region->xe;
+    cyb=yb.Exist()?yb:region->yb;
+    cye=ye.Exist()?ye:region->ye;
    }
-   else suc=suc && ixb.Exist() && ixe.Exist() && iyb.Exist() && iye.Exist(); // In "new" mode all parameters must exists
-   if(ixb.Exist()) xb=ixb(&suc);
-   if(ixe.Exist()) xe=ixe(&suc);
-   if(iyb.Exist()) yb=iyb(&suc);
-   if(iye.Exist()) ye=iye(&suc);
-   if(!suc) goto fail; // Something wrong
-   if(!r.Convert(xb,xe,yb,ye,isbbox)) goto fail; // Conversion failed
+   else
+   {
+    suc=suc && xb.Exist() && xe.Exist() && yb.Exist() && ye.Exist(); // In "new" mode all parameters must exists
+    cxb=xb; cxe=xe; cyb=yb; cye=ye;
+   }
+   if(!suc) {err="To specify region all four coordinates must be set"; goto fail;} // Something wrong
+   if(!r.Convert(cxb,cxe,cyb,cye,isbbox)) {err="Error conversion of coordinates to region"; goto fail;} // Conversion failed
    return r; // Case 3 with all parameters
   }
 
   case5:
   // Case 5
-  if(4==size || 5==size)
   {
-   bool isbbox=false;
-   if(5==size)
-   {
-    Base2String type(input,4);
-    std::string str=type(&suc);
-    if(!suc) goto fail; // Wrong parameter
-    tolower(str);
-    if("bbox"!=str || "nobbox"!=str) goto fail; // Unknown fifth parameter
-    if("bbox"==str) isbbox=true;
-   }
-   Base2Coord ixb(input,0), ixe(input,(isbbox?2:1)), iyb(input,(isbbox?1:2)), iye(input,3);
-   struct gmt_coord xb=ixb(&suc),yb=iyb(&suc),xe=ixe(&suc),ye=iye(&suc);
-   if(suc)
-   {
-    if(!r.Convert(xb,xe,yb,ye,isbbox)) goto fail; // Conversion failed
-    return r; // Case 4 with all parameters
-   }
+   OPosPar<Base2StringD> type("type","nobbox");
+   RPosPar<Base2Coord> p1("p1"),p2("p2"),p3("p3"),p4("p4");
+   ParsePositionalParameters params(input,p1,p2,p3,p4,type);
+
+   if(!params) {err=params.Error(); goto fail;} // Fail to parse by variant 5
+
+   bool isbbox=("bbox"==type.Value());
+   if("bbox"!=type.Value() && "nobbox"!=type.Value()) {err="Fifth parameter can be \"bbox\" or \"nobbox\" only"; goto fail;} // Unknown fifth parameter
+
+   if(!r.Convert(p1,isbbox?p3:p2,isbbox?p2:p3,p4,isbbox)) {err="Error conversion of coordinates to region"; goto fail;} // Conversion failed
+   return r; // Case 4 with all parameters
   }
 
   fail: